P0816

Downshift Switch Circuit

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Downshifting does not work
Check Engine Light Flashing
Car jerks when slowing down
The gearbox goes into emergency mode
Increased fuel consumption

Causes

Open or short circuit in switching circuit
Gear shift sensor malfunction
Problems with the brake pedal or brake pedal sensor
Malfunction of the transmission control unit
Oxidation of contacts in connectors

How to Fix

Check the integrity of the shift circuit wiring harness
Test the downshift sensor
Check the operation of the brake pedal and related sensors
Read error codes from the transmission control unit
Clean contacts and connectors in the circuit

Related codes

P0815 P0817 P0818